<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
  #colset    { -moz-column-count: 3; }
  #a         { height: 0px; }
  #b         { height: 2px; }
  #c         { height: 1px; }
  #d         { height: 2px; }
  #e         { height: 2px; }
</style>
<script type="text/javascript">
function boom()
{
  document.getElementById("a").style.height = "auto";
  document.getElementById("d").style.height = "auto";
}
</script>
</head>
<body onload="boom();"
  ><div id="colset"
    ><div id="a"><div id="b"/></div
    ><div id="c"><div id="d"/><div id="e"/></div
  ></div
></body>
</html>
